The combination of a very slow moving cold front and copious moisture from the remnants of Tropical Storm Tammy produced very heavy rain across Montgomery County from the early morning into the early evening of the 8th. Storm totals averaged from four inches in the southeast part of the county to nearly ten inches in the northwest part of the county and caused widespread poor drainage flooding as well as flooding along most of the creeks and rivers. Many vehicles were stuck in flood waters. The worst reported flood damage was in Pottstown where flooding along the Manatawny Creek and the Schuylkill River heavily damaged Memorial Park and Riverfront Park respectively. The Manatawny Creek also flooded homes on Manatawny and Walnut Streets and entered the borough's maintenance building. Elsewhere in the county, every New Hanover Township street was flooded. People were rescued from the flooding around the Robert Bruce Apartments in Hatboro and Upper Moreland Townships. The Collegeville Bridge over the Perkiomen Creek was closed between Collegeville and Lower Providence. In Norristown, flooding along the Schuylkill River caused flooding at its sewage treatment plant.  The Schuylkill River at Pottstown was above its 13 foot flood stage from 328 p.m. EDT on the 8th through 336 a.m. EDT on the 9th. It crested at 16.28 feet at 10 p.m. EDT on the 8th. Farther downstream, the Schuylkill River at Norristown was above its 17 foot flood stage from 124 a.m. EDT through 805 a.m. EDT on the 9th. It crested at 17.92 feet at 5 a.m. EDT. The Manatawny Creek at Pottstown was above its 6 foot flood stage from 739 a.m. EDT on the 8th through 552 a.m. EDT on the 9th. It crested at 12.38 feet at 945 p.m. EDT on the 8th. This was the highest crest on the creek since the remnants of Hurricane Agnes (17.1 feet) in June of 1972.  The East Branch of the Perkiomen Creek at Schwenksville was above its 7 foot flood stage from 1050 a.m. EDT through 701 p.m. EDT on the 8th. It crested at 7.63 feet at 3 p.m. EDT. Along the main stem of the Perkiomen Creek at East Greenville, it was above its 4 foot flood stage from 648 a.m. EDT on the 8th through 110 a.m. EDT on the 9th. It crested at 7.30 feet at 445 p.m. EDT on the 8th. Farther downstream, the Perkiomen Creek at Hillegass was above its 5 foot flood stage from 734 a.m. EDT on the 8th through Midnight EDT on the 9th. It crested at 6.45 feet at 530 p.m. EDT on the 8th. Farther downstream the Perkiomen Creek at Graterford was above its 11 foot flood stage from 126 p.m. EDT on the 8th through 447 a.m. EDT on the 9th. The Wissahickon Creek at Fort Washington was above its 9 foot flood stage from 933 p.m. EDT on the 8th through 159 a.m. EDT on the 9th. It crested at 10.6 feet at Midnight EDT on the 9th.Storm totals included 9.90 inches in Palm, 7.80 inches in Pottstown, 7.54 inches in Green Lane, 6.75 inches in Royersford, 6.23 inches in Wynnewood, 5.57 inches in Hatboro, 4.75 inches in Willow Grove and 4.10 inches in Ambler. This heavy rain helped the state of Pennsylvania have its second wettest October on record dating back to 1895. The statewide average precipitation total was 6.49 inches, 3.31 inches wetter than normal. Only 1976 (6.59 inches) was wetter. October 2005 was the wettest October on record at the Philadelphia International Airport with a precipitation total of 8.68 inches, 5.93 inches wetter than normal and surpassed the previous record by 2.02 inches.The cold front moved from near Pittsburgh, Pennsylvania at 8 p.m. EDT on the 7th, to the Susquehanna Valley in Pennsylvania at 2 a.m. EDT on the 8th, to the Poconos and Berks County in Pennsylvania and just west of Chesapeake Bay in Maryland at 8 a.m. EDT on the 8th. The cold front stalled as waves of low pressure road northeast along it. At 2 p.m. EDT on the 8th, the cold front just edged into northwestern New Jersey and the Philadelphia northwest suburbs and was still west of Chesapeake Bay in Maryland. At 8 p.m. EDT that evening the cold front barely moved into the Philadelphia New Jersey suburbs and the Delmarva Peninsula. The cold front and waves of low pressure cleared the Delaware and New Jersey coasts between Midnight EDT and 2 a.m. EDT on the 9th. The slow movement and stalling coupled with an unstable air mass and tropical moisture associated with Tammy helped enhance the torrential downpours. The flooding would have been even worse if not for the unseasonably dry weather that preceded this event from the middle of August.

Flash Flood in MONTGOMERY, PENNSYLVANIA
From 08-OCT-05 05:48:00 to 08-OCT-05 21:00:00 (EST)
Location: COUNTYWIDE
Property damage: 100K
Reported by: AWOS,ASOS,MESONET,ETC

Flood in MONTGOMERY, PENNSYLVANIA
From 08-OCT-05 21:00:00 to 09-OCT-05 07:05:00 (EST)
Reported by: AWOS,ASOS,MESONET,ETC